The current operational state of the gateway controller.
The standby(3) state indicates that it is in the standby
mode and no signaling packets can be passed. If
cmedGwyControllerAdminStatus is down(2) then
cmedGwyControllerOperStatus should be down(2).
If cmedGwyControllerAdminStatus is changed to
up(1), then cmedGwyControllerOperStatus should
change to up(1).
If the gateway controller is ready to transmit and receive
signaling traffic; it should remain in the down(2) state
if and only if there is a fault that prevents it from
going to the up(1) state